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You seem to have a good handle on your T-Mobile MDA--I hope that you don't mind me asking a quick question about Bluetooth DUN functionality on the MDA and other BT devices. I'm having problems getting my MDA to work my new Acura's Acuralink feature, which enables the car to connect to the Internet to send diagnostic info etc. I think it's a problem with the MS Bluetooth stack, because the feature works flawlessly with my Sony T68i and T-Mobile Internet. Any thoughts?

Here is a GPRS modem command setting that you can try:
AT+CGDCONT=1,"IP","wap.voicestream.com". Depending on the T-Mobile service you may want to try internet2.voicestream.com or internet3.voicestream.com .

I assume that you have been able to pair the Acura and it shows up in your Bluetooth connections.

I'm not able to specify modem init strings with the Acura setup menu. :( I can specify a dialing number, a user name, and a password. I can see the phone's bluetooth light blink when the test first tries to connect, but it just fails. Do you know if there's a way to turn on debug/error messages on the MDA in the WM5 registry?

I don't believe there is a diag mode in the production BT stack. You might try spaces in the user and password field. It could also be the com port that AcuraLink uses. Windows XP uses COM4 with the MDA. During the pairing and discovery process AcuraLink should determine the available com ports. If you could pair a Windows XP machine with your T68i and see what port it uses. We may be able to change the port on the MDA. I believe you can change the DUN com port in the Windows Mobile registry, I will have to research it.

I also saw that the Acura site shows no support for AcuraLink and the MDA.